Reinforced roller needle bearing

Abstract

The utility model relates to the technical field of roller needle bearings, in particular to a reinforced roller needle bearing. Comprising a bearing outer ring, a bearing inner ring arranged in the bearing outer ring, and a plurality of roller pins arranged between the bearing outer ring and the bearing inner ring, the loose ribs are symmetrically arranged at the two ends of the roller pin and are arranged between the bearing outer ring and the bearing inner ring; the sealing rings are arranged between the loose ribs and the bearing outer ring; the clamping rings are symmetrically arranged on the two end faces of the bearing inner ring and used for tightly connecting the bearing inner ring and the loose rib together, the clamping rings are arranged in wedge-shaped grooves of the bearing inner ring, and the clamping rings are matched with the wedge-shaped grooves. The reinforced roller needle bearing has the advantages of being higher in axial bearing capacity, higher in impact resistance, long in service life, more stable and firmer in structure and the like.

Description

Technical Field

[0001] This utility model relates to the field of roller needle bearing technology, and in particular to a reinforced roller needle bearing. Background Technology

[0002] A flat-retainer type needle roller bearing typically consists of an outer ring, an inner ring, a seal, a flat retainer ring, and several needle rollers. Because it is a full complement needle roller bearing, it is suitable for low-speed, heavy-load applications, primarily bearing radial loads. With special designs, it can withstand certain axial loads and is widely used in linear guide structures. The difference between a flat-retainer type needle roller bearing and a regular needle roller bearing is that the outer ring is particularly thick; the outer diameter of the outer ring is the working surface, supporting the relative movement between the guide rails.

[0003] Chinese patent CN201610895U discloses a roller needle bearing, including an outer ring, an inner ring, needle rollers, and two flat retaining rings. The outer ring of the flat retaining ring has an outer groove for placing an open-type elastic sealing ring, and the outer wall of the sealing ring rests against the inner wall of the outer ring. A receiving groove for placing a rubber-plastic sealing ring is provided in the end face of the outer ring. The outer and inner rings of the rubber-plastic sealing ring are respectively engaged in the groove of the outer ring and on the inclined surface of the flat retaining ring. This bearing achieves a connection between the flat retaining ring and the inner ring as a whole through an interference fit between the inner diameter of the flat retaining ring and the outer diameter of the inner ring retaining groove. This type of bearing can withstand a small amount of axial load. Its axial load capacity depends on the bonding force generated by the interference fit between the flat retaining ring and the inner ring. If the interference fit is too large, it will cause the inner diameter to become smaller or the inner diameter taper to exceed tolerance during assembly, resulting in dimensional defects. If the interference fit is too small, the entire bearing will disintegrate when subjected to a large impact load during handling and transportation.

[0004] Chinese patent CN201232706Y discloses a flat retainer ring roller needle bearing. This utility model points out the shortcomings of the roller needle bearing, which achieves the connection between the flat retainer ring and the inner ring as a whole by interference fit between the inner diameter of the flat retainer ring and the outer diameter of the inner ring retaining groove. It discloses an improved structure, in which the inner holes of the two flat retainer rings respectively transition fit with the outer diameter of the two stop rings of the bearing inner ring. At the mating points between the stop rings at both ends of the bearing inner ring and the inner holes of the flat retainer rings, 4 to 8 riveting points are evenly distributed. This improved structure needs to ensure that the hardness of the bearing inner ring, excluding the raceway, is in the range of HRC17 to 24, and the hardness of the raceway after local quenching is HRC58 to 64.

[0005] However, this technical solution involves direct contact between the retaining ring and the inner ring, which can lead to loosening, insufficient stability, and poor sealing over prolonged use. Furthermore, the varying hardness requirements of the bearing inner ring not only increase the difficulty and cost of heat treatment but also reduce its strength, making it prone to quality issues such as impact damage during bearing and shaft assembly, deformation after installation, and bearing misalignment. Additionally, metal shavings may be generated at the riveting point during the riveting process. If these shavings fall into the bearing through the clearance, the bearing is highly susceptible to damage during use. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a reinforced roller needle bearing. A retaining ring is installed between the bearing inner ring and the flat retaining ring, allowing the two to achieve a tight fit without reducing the strength of the bearing inner ring or requiring special treatment. This prevents the bearing from disintegrating under impact and improves the bearing's axial load-bearing capacity.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A reinforced roller needle bearing includes: an outer ring, an inner ring disposed inside the outer ring, a plurality of needle rollers disposed between the outer ring and the inner ring, a flat retainer ring symmetrically disposed at both ends of the needle rollers and disposed between the outer ring and the inner ring, and a sealing ring disposed between the flat retainer ring and the outer ring. It further includes: retaining rings symmetrically disposed on both end faces of the inner ring for tightly connecting the inner ring and the flat retainer ring, the retaining rings being disposed within a wedge groove of the inner ring and adapted to the wedge groove.

[0009] Preferably, the retaining ring has a notch, and its cross-section is generally conical.

[0010] Preferably, the taper of the wedge groove is 60°~80°.

[0011] Preferably, the taper of the end of the flat retaining ring opposite to the wedge groove is 60°~80°.

[0012] Preferably, the outer wall of the bearing outer ring is rounded.

[0013] Preferably, a grease injection groove is provided in the middle of the inner ring of the bearing, and a plurality of grease injection holes leading to the needle roller are provided in the grease injection groove.

[0014] Preferably, the taper of the grease injection groove is 50°-70°.

[0015] Preferably, the hardness range of the outer ring and the inner ring of the bearing after heat treatment is HRC58~64.

[0016] The beneficial effects of this utility model are as follows:

[0017] This utility model utilizes the wedge structure principle to tightly connect the flat retainer ring and the bearing inner ring into a whole through the retaining ring, making the overall structure of the bearing more stable and firm, thereby increasing the axial load capacity, impact resistance, and service life of the bearing. After the bearing inner ring and the flat retainer ring are connected by this utility model, the inner diameter of the bearing inner ring is not affected, which can ensure that its fit with the shaft is not affected, thereby ensuring the bearing load capacity and operational stability. (3) This utility model has a notch on the retaining ring, and its cross-section is generally conical. The notch allows the retaining ring to be easily opened and closed, which facilitates the installation and disassembly of the retaining ring, improves the assembly efficiency, and the existence of the notch gives the retaining ring a certain elasticity, which can adapt to bearing inner rings and flat retainer rings of different sizes; the conical cross-section can provide a larger contact area and stronger fixing force. During the installation process, the conical structure can be better embedded in the wedge groove, thereby providing a more solid fixing effect, which helps to withstand larger axial loads and prevent the retaining ring from loosening or falling off during use.

[0018] (4) This utility model uses copper rings for connection. Copper has excellent thermal conductivity. The copper rings can effectively conduct the heat generated inside the bearing to the outside, which helps to reduce the working temperature of the bearing and extend its service life.

[0019] (5) By modifying the outer wall of the bearing outer ring with a circular arc, this utility model can effectively reduce the stress concentration phenomenon on the outer wall of the bearing outer ring, make the stress distribution more uniform, improve the bearing capacity of the bearing outer ring, extend the service life of the bearing, and the circular arc modification can increase the contact area between the bearing outer ring and adjacent components, which can better distribute the load, reduce the pressure per unit area, thereby improving the bearing capacity of the bearing and enabling it to withstand greater loads.

[0020] In summary, this utility model has advantages such as higher axial load capacity, stronger impact resistance, longer service life, and more stable and robust structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A;

[0023] Figure 3 This is a cross-sectional view of the inner ring of the bearing of this utility model;

[0024] Figure 4 This is a schematic diagram of the retaining ring of this utility model;

[0025] Figure 5 This is a schematic diagram of the outer arc modification of the outer wall of the bearing outer ring according to this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] Example

[0029] like Figure 1-5 As shown, this embodiment provides a reinforced roller needle bearing, including: an outer bearing ring 1, an inner bearing ring 2 disposed inside the outer bearing ring 1, a plurality of needle rollers 3 disposed between the outer bearing ring 1 and the inner bearing ring 2, a flat retaining ring 4 symmetrically disposed at both ends of the needle rollers and disposed between the outer bearing ring 1 and the inner bearing ring 2, and a sealing ring 5 disposed between the flat retaining ring 4 and the outer bearing ring 1. It also includes: retaining rings 6 symmetrically disposed on the two end faces of the inner bearing ring 2 for tightly connecting the inner bearing ring 2 and the flat retaining ring 4 together. The retaining rings 6 are disposed within a wedge groove 21 of the inner bearing ring 2, and the retaining rings 6 are adapted to the wedge groove 21. Utilizing the wedge structure principle, the retaining rings 6 tightly connect the flat retaining ring 4 and the inner bearing ring 2 into a whole, resulting in higher axial load capacity, stronger impact resistance, and extended bearing service life.

[0030] In this case, after the bearing inner ring 2 is connected to the flat retaining ring 4 by the retaining ring 6, the inner diameter of the bearing inner ring 2 is not affected, which can ensure that its fit with the shaft is not affected, thereby ensuring the bearing's load-bearing capacity and operational stability.

[0031] Meanwhile, the retaining ring 6 is provided with a notch 61, the cross-section of which is generally conical. The notch 61 allows the retaining ring 6 to be easily opened and closed, which facilitates the installation and disassembly process of the retaining ring 6 and improves assembly efficiency. In addition, the presence of the notch 61 gives the retaining ring 6 a certain degree of elasticity, which can adapt to bearing inner rings 2 and flat retaining rings 4 of different sizes. When there is a certain tolerance in the size of the bearing, the retaining ring 6 can adjust its inner diameter through the elastic deformation of the notch 61, thereby achieving the fixation of components of different sizes and increasing the applicability and flexibility of the retaining ring 6.

[0032] In this embodiment, the tapered cross section can provide a larger contact area and stronger fixing force. During installation, the tapered structure can be better embedded in the wedge groove 21, thereby providing a more secure fixing effect, which helps to withstand larger axial loads and prevents the retaining ring 6 from loosening or falling off during use.

[0033] In this embodiment, the retaining ring 6 is preferably a copper ring. Copper has excellent thermal conductivity, and the copper ring can effectively conduct the heat generated inside the bearing to the outside, which helps to reduce the operating temperature of the bearing and extend its service life.

[0034] In this embodiment, the taper of the wedge groove 21 is 60°~80°, preferably 70°, and the taper of the end of the flat retaining ring 4 opposite to the wedge groove 21 is 60°~80°, preferably 70°, which can maximize the tight connection between the flat retaining ring 4, the bearing inner ring 2 and the retaining ring 6, making the bearing structure more stable and robust.

[0035] In this embodiment, the outer wall of the bearing outer ring 1 is rounded, which improves the radial load-bearing capacity of the bearing. Specifically, the rounded shape can effectively reduce stress concentration on the outer wall of the bearing outer ring 1, making the stress distribution more uniform. Through a smooth transition, sharp edges are eliminated, allowing stress to be more evenly distributed on the surface of the bearing outer ring 1, thereby improving the load-bearing capacity of the bearing outer ring 1 and extending the service life of the bearing. Furthermore, the rounded shape can increase the contact area between the bearing outer ring 1 and adjacent components, which can better distribute the load, reduce the pressure per unit area, and thus improve the load-bearing capacity of the bearing, enabling it to withstand greater loads.

[0036] In this embodiment, a grease injection groove 22 is provided in the middle of the inner ring 2 of the bearing. The grease injection groove 22 is preferably annular to facilitate disassembly and assembly. The grease injection groove 22 is provided with a plurality of grease injection holes 23 leading to the needle roller 3, so that grease can be injected into the bearing through the grease injection holes 23 without disassembly and assembly. The operation is simple and convenient.

[0037] Of course, the taper of the grease injection groove 22 is 50°-70°, preferably 60°. A taper of 60° can increase the opening area of ​​the grease injection groove 22, thereby accommodating more grease in the same volume of grease injection groove 22, improving grease injection efficiency. The taper design also helps the grease flow, making it easier for the grease to flow and distribute in the grease injection groove 22, reducing the retention and accumulation of grease in the grease injection groove 22, thereby improving the grease injection efficiency and ensuring that the grease can be evenly distributed in the parts that need lubrication.

[0038] In addition, the hardness range of the outer ring 1 and the inner ring 2 of the bearing after heat treatment is HRC58~64. The heat treatment process of the product is simple and economical, and the production cost is lower.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reinforced roller needle roller bearing, comprising: The bearing comprises an outer ring, an inner ring disposed inside the outer ring, a plurality of needle rollers disposed between the outer ring and the inner ring, a flat retainer ring symmetrically disposed at both ends of the needle rollers and disposed between the outer ring and the inner ring, and a sealing ring disposed between the flat retainer ring and the outer ring, characterized in that it further comprises: retaining rings symmetrically disposed on the two end faces of the inner ring for tightly connecting the inner ring and the flat retainer ring together, the retaining rings being disposed in a wedge groove of the inner ring and the retaining rings being adapted to the wedge groove.

2. The reinforced roller needle bearing according to claim 1, characterized in that, The retaining ring has a notch, and its cross-section is generally conical.

3. The reinforced roller needle bearing according to claim 1, characterized in that, The taper of the wedge groove is 60°~80°.

4. The reinforced roller needle bearing according to claim 1, characterized in that, The flat retaining ring has a taper of 60°~80° at one end opposite to the wedge groove, and is adapted to the taper of the wedge groove.

5. A reinforced roller needle bearing according to claim 1, characterized in that, The outer wall of the bearing outer ring is rounded.

6. A reinforced roller needle bearing according to claim 1, characterized in that, The bearing inner ring has a grease injection groove in the middle, and the grease injection groove has several grease injection holes leading to the needle roller.

7. A reinforced roller needle bearing according to claim 6, characterized in that, The taper of the grease injection groove is 50°~70°.

8. A reinforced roller needle bearing according to claim 1, characterized in that, The hardness range of both the outer ring and the inner ring of the bearing after heat treatment is HRC58~64.

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